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We investigated phylogenetic and biogeographic relationships within Juglans (walnuts), a Tertiary disjunct genus, using 15 species of Juglans and related (Juglandaceae) outgroups. The relationships were analyzed using nucleotide sequences of the chloroplast gene matK and its flanking spacers and of the internal transcribed spacers (ITS) and 5.8S gene of the(More)
Tribal and generic relationships within Theaceae were investigated using cladistic analyses of chloroplast-encoded rbcL and matK + flanking intergenic spacer region data. Molecular data were employed because recent morphological and anatomical studies of tea (Camellia sinensis) and related plant species provide conflicting support for tribal and generic(More)
Restriction site variation in chloroplast DNA (cpDNA) was surveyed to analyze population dynamics in Liriodendron tulipifera L., a woody angiosperm found in eastern North America. Two cpDNA haplotypes, differing by the presence or absence of five restriction site changes (nucleotide sequence divergence estimated as approximately 0.15%) are geographically(More)
Ophioglossaceae are a putatively ancient lineage of ferns in which the aerial portion of the plant is composed of a single leaf. The simplicity of foliar morphology has limited the number of characters available for constructing classifications and contributed to taxonomic difficulties at nearly every level of classification within the family. Analysis of(More)
Alcohol dehydrogenase isozymes in Camellia japonica are encoded by two genes, Adh-1 and Adh-2. Both loci are expressed in seeds, and their products randomly associate into intragenic and intergenic dimers. Electrophoresis of leaf extracts reveals only the products of Adh-2. Formal genetic analysis indicated that the two Adh loci are tightly linked (combined(More)
Variation in the yellow-flowered species of Erythro~i~m (Liliaeeae) of the Eastern United States, the M_idwest, and adjacent Canada has for some time been a puzzle to some field taxonomists, and completely overlooked by others. Although these species generally have in common such characteristics as the yellow perianth-segments with red-brown markings; the(More)
Six interspecific backcross prog enies were generated by crossing hybrids ofC. saluenensis XC. japonica (C. Xwilliamsii) back toC. japonica. Segregation data were obtained within these six families for five traits, three involving flavonoid constituents and two pubescence characters. A single major gene seemed to be primarily involved in each case, and two(More)
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